CVE-2006-4342

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2022-05-01. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 5.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The kernel in Red Hat Enterprise Linux 3, when running on SMP systems, allows local users to cause a denial of service (deadlock) by running the shmat function on an shm at the same time that shmctl is removing that shm (IPC_RMID), which prevents a spinlock from being unlocked.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
31st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 17, 2006

Last Modified

April 23, 2026

Advisory Details (6)

Auto-updated May 31, 2026
Patch available. Sources: cert, redhat.
generic

ASA-2006-254 (RHSA-2006-0710)

http://support.avaya.com/elmodocs2/security/ASA-2006-254.htm
generic

About Secunia Research | Flexera

http://secunia.com/advisories/23064
generic

About Secunia Research | Flexera

http://secunia.com/advisories/22497
redhatMentions a patch (unverified)

Full Text Bug Listing

Affected: Red Hat Enterprise Linux 3 product line. The current stable release is 3.9. For Red Hat Enterprise Linux 6 and above, please

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=205618
generic

Support

http://www.redhat.com/support/errata/RHSA-2006-0710.html
cert

VU#245984 - The Red Hat Enterprise Linux 3 SMP Kernel fails to properly handle IPC shared-memory

http://www.kb.cert.org/vuls/id/245984

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatkernel-0:2.4.21-47.0.1.EL2006-10-20redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 6× in last 7d / 12× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 102 total refreshes for this CVE.

  1. 2026-10-09 19:59 UTCEPSS rescore
  2. 2026-10-08 16:32 UTCEPSS rescore
  3. 2026-10-07 23:36 UTCEPSS rescore
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  8. 2026-09-29 03:01 UTCEG score recompute
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  22. 2026-07-23 00:51 UTCEG score recompute
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  24. 2026-07-22 23:55 UTCEG score recompute
  25. 2026-07-22 21:35 UTCEG score recompute
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  1. 2026-07-20 17:02 UTCEPSS rescore
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  53. 2026-05-31 22:28 UTCEPSS rescore
  54. 2026-05-31 06:20 UTCEG score recompute
  55. 2026-05-31 06:20 UTCVendor advisory
  56. 2026-05-31 06:19 UTCGHSA enrichment
  57. 2026-05-31 00:13 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2006-4342?
CVE-2006-4342 is a medium vulnerability published on October 17, 2006. The kernel in Red Hat Enterprise Linux 3, when running on SMP systems, allows local users to cause a denial of service (deadlock) by running the shmat function on an shm at the same time that shmctl is removing that shm (IPC_RMID), which prevents a spinlock from being unlocked.
When was CVE-2006-4342 disclosed?
CVE-2006-4342 was first published on October 17, 2006, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2006-4342 actively exploited?
CVE-2006-4342 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2006-4342?
CVE-2006-4342 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2006-4342?
A fix for CVE-2006-4342 is available: update to the fixed version the vendor names in its advisory.

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